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  • Autolite Platinum Spark Plug – HT15 (High Thread Pro®)
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Autolite Platinum Spark Plug – HT15 (High Thread Pro®)
Autolite Platinum Spark Plug – HT15 (High Thread Pro®)
Load image into Gallery viewer, Autolite Platinum Spark Plug – HT15 (High Thread Pro®)
Load image into Gallery viewer, Autolite Platinum Spark Plug – HT15 (High Thread Pro®)

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Autolite Platinum Spark Plug – HT15 (High Thread Pro®)

AUTOLITE
ELE1931
In stock
$34.00 $29.99
Description:The Autolite HT15 Platinum Spark Plug is part of Autolite’s High Thread Pro® series, an OE...
$29.99
Autolite Platinum Spark Plug – HT15 (High Thread Pro®)
Description

Description:
The Autolite HT15 Platinum Spark Plug is part of Autolite’s High Thread Pro® series, an OE patented design developed specifically for Ford 3-valve (3V) engines. This advanced design improves engine durability, ignition performance, and heat management while helping maintain optimal engine efficiency.

The fine-wire platinum center electrode delivers a more focused ignition spark for improved combustion efficiency, smoother operation, and extended service life. A copper core center electrode enhances heat transfer, helping maintain proper operating temperatures and reducing fouling.

The High Thread Pro® design positions the threads above the cylinder head seating surface, allowing for a stronger compressive seal that improves heat transfer and durability. The specially engineered ground strap further enhances heat dissipation compared to standard J-gap spark plugs. Combined with a high alumina ceramic insulator, the HT15 spark plug provides excellent dielectric strength, thermal conductivity, and reliable ignition performance.

Features:

  • High Thread Pro® OE patented design developed for Ford 3V engines

  • Fine-wire platinum center electrode for focused ignition and longer service life

  • Copper core center electrode improves heat transfer and fouling resistance

  • Improved ground strap design enhances heat dissipation over standard J-gap plugs

  • Thread placement above the cylinder head seating creates a stronger compressive seal

  • High alumina ceramic insulator provides excellent thermal conductivity and insulation

Product Specifications:

  • Part number: HT15

  • Brand: Autolite

  • Product type: Platinum spark plug

  • Center electrode core material: Copper

  • Center electrode tip material: Platinum

  • Center electrode design: Fine wire

  • Ground electrode core material: Nickel

  • Ground electrode tip material: Nickel

  • Ground configuration: Single

  • Ground electrode quantity: 1

  • Thread diameter: 12 mm

  • Seat type: Tapered

  • Washer included: No

  • Reach: 0.702 in

  • Hex size: 9/16 in

  • Resistor type: Yes

  • Resistance: 5000 ohms

  • Pre-gap size: 0.045 in

  • Manufacturer heat range: 11

  • Insulator material: Ceramic

  • Center electrode projection: Extra-long special projection

  • Electrical terminal type: Non-removable nut

  • Skirt: Yes

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If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.

Returns

Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.

Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.

Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.

Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).

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